High-G FJR Junkie!
Join Date: Jan 2013
Location: Millgrove, ON, CA
Good article, Sparky, good explanation of the basics. One of the features of pretty much all FI systems is that when you roll off throttle to zero or near zero, a fuel cut takes place. Emissions thing to stop unburned gasses in the exhaust, wasted fuel, good for the environment. ECU basically shuts off the injectors until you roll on some throttle again. On '06-'07 in particular, this was not good in combination with it's rather lean system, when you roll back on you get "throttle snatch". It's a feature of FI, but some manage it better than others, very difficult to manage on '06-'07, and add-on modules don't fix it... they help if you tailor your map to add fuel in at the lowest throttle openings.
There are other factors, ambient intake air temp, etc.... there are add-ons out there to fool the ECU into thinking it's getting different air temp, but from all I've read on various bikes, these do little.
Ivan's flash (and others) remove the fuel cut, and that is a huge improvement. Another thing Ivan does is alter the timing curve a tad so it is slightly more advanced... too advanced and you'll get pinging under load, but a higher octane fuel can mitigate that. Ivan recommends 89 for Gen3, not sure what he says for Gen2... IMHO you don't need to but if fuel mileage increases to offset the extra cost....
I did not notice any pinging on a week-long trip with my Gen3 flash, using regular fuel in varying conditions, although I was not riding in hot summer to be fair, still don't think it would be a problem, just don't lug the engine down. I can't say I saw much of a mileage improvement, maybe a tad that's all.
So far Gen2 riders seem to love the Ivan flash, haven't heard one negative, but those with it perhaps can comment more on the fuel cut, mileage, etc.
Cost? I think you'll find it comparable... what you'll spend on add-ons to "fix" vs. a flash, and the add-ons just can't fix it.
Keep yer stick on the ice....
2014 FJR1300A - Root Beer (sold)
2009 CBF1000A - Sienna Red
1999 VFR800Fi - Pearl Shining Yellow